Exercise device



FIG. 1 is a left perspective view of an exercise device;

FIG. 2 is a front elevational view thereof, a rear elevational view and top and bottom plan views being mirror images thereof; and,

FIG. 3 is a left side elevational view thereof, a right side elevational view being a mirror image thereof.

The broken lines in the figures are to illustrate environmental structure only and form no part of the claimed design. 

CLAIM The ornamental design for an exercise device, as shown and described. 